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poweropcodes: Fix sreq. 

Including bits of rot_sh in the rA and MQ calculations is nonsensical since it is a rotation count and not a source of bits to be extracted or rotated.
The mask is not complicated, so we don't need to use power_rot_mask.
This commit is contained in:
joevt 2024-04-09 02:45:11 -07:00 committed by dingusdev
parent 24bce16c4d
commit bce816139b
1 changed files with 3 additions and 3 deletions
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6
cpu/ppc/poweropcodes.cpp
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@ -588,10 +588,10 @@ template <field_rc rec>
void dppc_interpreter::power_sreq() {
ppc_grab_regssab(ppc_cur_instruction);
unsigned rot_sh = ppc_result_b & 0x1F;
unsigned mask = power_rot_mask(rot_sh, 31);
uint32_t mask = -1U >> rot_sh;
ppc_result_a = ((rot_sh & mask) | (ppc_state.spr[SPR::MQ] & ~mask));
ppc_state.spr[SPR::MQ] = rot_sh;
ppc_result_a = (ppc_result_d >> rot_sh) | (ppc_state.spr[SPR::MQ] & ~mask);
ppc_state.spr[SPR::MQ] = (ppc_result_d >> rot_sh) | (ppc_result_d << (32 - rot_sh));
if (rec)
ppc_changecrf0(ppc_result_a);